@font-face{font-family:Instrument;src:url('../../assets/fonts/instrument-sans-latin-400-normal.woff2');font-display:swap}
@font-face{font-family:Instrument;src:url('../../assets/fonts/instrument-sans-latin-600-normal.woff2');font-weight:600;font-display:swap}
@font-face{font-family:Anybody;src:url('../../assets/fonts/anybody-var.woff2');font-weight:100 900;font-display:swap}
@font-face{font-family:JetBrains;src:url('../../assets/fonts/jetbrains-mono-latin-400-normal.woff2');font-display:swap}
@font-face{font-family:JetBrains;src:url('../../assets/fonts/jetbrains-mono-latin-500-normal.woff2');font-weight:500;font-display:swap}

:root{--app-accent:#ff8a1f;--accent-text:#ff9d43;--bg:#0b1015;--panel:#111920;--raised:#1d2832;--line:#2b3741;--fg:#ecf0f2;--muted:#a3afb9;--soft:#7d8a95;
  --good:#71d8bd;--warn:#ffc66b;--bad:#ff7a66;--lin:#5ccfe6;--ease:#ff8a1f;--stage:#0a1117;--stage-line:#1d2a35;--eye:#f6f8fa;--pupil:#12202a;--floor:#3b4955;
  --font:Instrument,system-ui,sans-serif;--display:Anybody,system-ui,sans-serif;--mono:JetBrains,ui-monospace,monospace}
:root[data-theme=light]{--bg:#f4f2ee;--panel:#fff;--raised:#eeeae4;--line:#d8d3cb;--fg:#1b2933;--muted:#5c6870;--soft:#7a858c;--accent-text:#a64c00;
  --good:#167a62;--warn:#9a6200;--bad:#b8321f;--lin:#0a84a0;--ease:#e56f00;--stage:#f8f6f2;--stage-line:#e4ded5;--eye:#ffffff;--pupil:#1b2933;--floor:#b9b1a6}

body{font-family:var(--font);font-size:15px;background:radial-gradient(ellipse at 88% 0,#ff8a1f0d,transparent 40%),var(--bg)}
button{transition:background .15s,border-color .15s;touch-action:manipulation}
button.primary{background:var(--app-accent);color:#241204;border-color:var(--app-accent)}button.primary:hover{background:#ffa24b;border-color:#ffa24b}
button[aria-pressed=true]{border-color:var(--app-accent);background:color-mix(in srgb,var(--app-accent) 12%,var(--panel))}
button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible{outline:2px solid var(--app-accent);outline-offset:3px}
input[type=range]{accent-color:var(--app-accent);min-height:36px}
output{color:var(--accent-text);font:500 13px var(--mono)}
.eyebrow{font:10px var(--mono);color:var(--accent-text);letter-spacing:.11em;margin-bottom:9px}

/* header + hero */
.app-header{max-width:none;padding:12px max(24px,calc((100vw - 1400px)/2));min-height:70px}
.app-header strong{font-size:12px;letter-spacing:.13em}.app-header strong span{margin-left:12px;color:var(--muted);font:10px var(--mono)}
.app-main{max-width:1440px;padding:38px 24px 28px}
.intro{display:flex;align-items:center;justify-content:space-between;gap:30px;padding:0 0 30px}
.intro h1{font:650 clamp(38px,4.8vw,66px)/1.04 var(--display);letter-spacing:-.045em}.intro h1 span{color:var(--accent-text)}
.intro-note{display:flex;align-items:center;gap:22px;max-width:480px}.intro-note p{color:var(--muted);font-size:14px;line-height:1.7}
.intro-glyph{width:92px;height:92px;flex:0 0 92px;fill:none}
.ig-axis{stroke:var(--soft);stroke-width:2;stroke-linecap:round}.ig-curve{stroke:var(--accent-text);stroke-width:4;stroke-linecap:round}
.ig-dots circle{fill:var(--bg);stroke:var(--accent-text);stroke-width:2}

/* question cards */
.section-label{display:flex;justify-content:space-between;gap:12px;font:10px var(--mono);letter-spacing:.11em;color:var(--muted);margin-bottom:10px}
.section-label span:first-child{color:var(--accent-text)}
.question-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;margin-bottom:20px}
.question-grid button{text-align:left;min-width:0;padding:14px 15px 15px;background:var(--panel);border-radius:12px;position:relative;display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-start}
.question-grid button[aria-pressed=true]:after{content:'';position:absolute;inset:auto 15px -1px;height:3px;background:var(--app-accent);border-radius:3px}
.question-grid span{display:block;font:9px var(--mono);color:var(--accent-text);letter-spacing:.06em;margin-bottom:9px}
.question-grid strong{font-size:14.5px;line-height:1.3;display:block}
.question-grid small{display:block;margin-top:6px;font-size:11px;line-height:1.45;color:var(--muted);font-weight:400}

/* bench */
.bench{border:1px solid var(--line);border-radius:17px;overflow:hidden;background:var(--panel);scroll-margin-top:12px;box-shadow:0 18px 60px #00000022}
.bench:focus{outline:none}
.bench-toolbar{padding:12px 16px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.transport{display:flex;gap:6px}.transport button{min-height:42px;font-size:12.5px;padding:6px 13px}
#play{min-width:104px}
.tabs{padding:4px;border:1px solid var(--line);border-radius:11px;background:var(--bg);display:flex;gap:4px}
.tabs button{border:0;background:transparent;min-height:36px;font-size:12px;padding:6px 13px}
.tabs button[aria-pressed=true]{background:var(--app-accent);color:#241204}
.tabs button[aria-pressed=false]{color:var(--muted)}
.bench-actions{display:flex;gap:8px;margin-left:auto}.bench-actions button{min-height:42px;font-size:12px}

.meter-strip{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));border-bottom:1px solid var(--line);background:var(--bg)}
.readout{padding:12px 18px 13px;border-right:1px solid var(--line);min-width:0;position:relative}.readout:last-child{border-right:0}
.readout span{display:block;font:9px var(--mono);letter-spacing:.1em;color:var(--muted)}
.readout strong{display:block;font:500 22px/1.35 var(--mono);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.readout strong small{font:11px var(--mono);color:var(--muted)}
.readout em{display:block;font-style:normal;font-size:11px;color:var(--muted);line-height:1.4;margin-top:1px}
.readout[data-tone]:before{content:'';position:absolute;top:15px;right:14px;width:7px;height:7px;border-radius:50%;background:var(--good);box-shadow:0 0 10px currentColor;color:var(--good)}
.readout[data-tone=warn]:before{background:var(--warn);color:var(--warn)}.readout[data-tone=bad]:before{background:var(--bad);color:var(--bad)}
.readout[data-tone=bad] strong{color:var(--bad)}

.workspace{display:grid;grid-template-columns:292px minmax(0,1fr);align-items:start}
.visuals{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(0,1fr);border-left:1px solid var(--line);min-width:0}
.panel{padding:16px 18px 18px;min-width:0}
.race-panel{border-right:1px solid var(--line)}
.panel-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.panel-head h2{font:620 24px/1.1 var(--display);letter-spacing:-.03em}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:11px;color:var(--muted);padding-top:4px}
.legend i{display:inline-block;width:14px;height:3px;border-radius:2px;margin-right:6px;vertical-align:middle;background:var(--ease)}
.legend i.lin{background:var(--lin)}.legend i.lin.dash{background:repeating-linear-gradient(90deg,var(--lin) 0 4px,transparent 4px 7px)}
.legend i.ghost{width:11px;height:11px;border-radius:50%;background:transparent;border:1.2px solid color-mix(in srgb,var(--ease) 55%,transparent)}
.legend i.dot{width:8px;height:8px;border-radius:50%;background:var(--ease)}
.legend i.tick{width:2px;height:11px;background:var(--fg);box-shadow:5px 0 0 var(--soft),10px 0 0 var(--soft);margin-right:16px}
.race-panel .legend{margin-top:8px}

.stage-wrap{background:var(--stage);border:1px solid var(--stage-line);border-radius:12px;overflow:hidden}
#stage{display:block;width:100%;height:clamp(330px,30vw,420px)}
.timeline{margin-top:10px;padding:10px 12px 6px;border:1px solid var(--line);border-radius:11px;background:var(--bg)}
.timeline input{margin:2px 0 0}

/* timing graph */
.graph-wrap{background:var(--stage);border:1px solid var(--stage-line);border-radius:12px;overflow:hidden;touch-action:none}
.graph{display:block;width:100%;height:auto;aspect-ratio:560/452;user-select:none;-webkit-user-select:none}
.graph text{font-family:var(--mono)}
.cg-hit{fill:transparent;cursor:ew-resize}
.cg-line{stroke:var(--stage-line);stroke-width:1}
.cg-key{stroke:var(--soft);stroke-width:1;opacity:.6}
.cg-avg{stroke:var(--lin);stroke-width:1;stroke-dasharray:3 4;opacity:.75}
.cg-avg-label{font-size:9.5px;fill:var(--lin)}
.cg-axis{font-size:10px;fill:var(--soft)}.cg-axis-key{fill:var(--fg);font-weight:500}
.cg-title{font-size:9.5px;fill:var(--accent-text);letter-spacing:.1em}
.cg-sub{font-size:9.5px;fill:var(--soft)}
.cg-ftick{stroke:var(--soft);stroke-width:1}
.cg-lin{fill:none;stroke:var(--lin);stroke-width:1.6;stroke-dasharray:5 5;opacity:.85}
.cg-lin-speed{fill:none;stroke:var(--lin);stroke-width:1.4;stroke-dasharray:5 5;opacity:.8}
.cg-curve{fill:none;stroke:var(--ease);stroke-width:3;stroke-linecap:round;stroke-linejoin:round;pointer-events:stroke;cursor:ew-resize}
.cg-speed{fill:none;stroke:var(--ease);stroke-width:2.2;stroke-linejoin:round}
.cg-area{fill:color-mix(in srgb,var(--ease) 13%,transparent);stroke:none}
.cg-frame{fill:var(--stage);stroke:var(--ease);stroke-width:1.6}
.cg-proj-line{stroke:var(--ease);stroke-width:.8;stroke-dasharray:1 3;opacity:.45}
.cg-ruler{stroke:var(--soft);stroke-width:1.2}.cg-ruler-end{stroke:var(--fg);stroke-width:1.4}
.cg-tick{stroke:var(--ease);stroke-width:1.5}.cg-tick-key{stroke:var(--fg);stroke-width:2}
.cg-arm{stroke:var(--fg);stroke-width:1.3;opacity:.7}
.cg-handle{cursor:grab;outline:none}.cg-handle:active{cursor:grabbing}
.cg-handle-hit{fill:transparent}
.cg-handle-dot{fill:var(--fg);stroke:var(--stage);stroke-width:2.5}
.cg-handle:hover .cg-handle-dot,.cg-handle:focus-visible .cg-handle-dot{fill:var(--app-accent)}
.cg-handle:focus-visible .cg-handle-hit{stroke:var(--app-accent);stroke-width:2}
.cg-handle-label{font-size:10px;fill:var(--fg);pointer-events:none}
.cg-ph-line{stroke:var(--fg);stroke-width:1;opacity:.45}
.cg-ph-h{stroke:var(--ease);stroke-width:1;stroke-dasharray:3 3}
.cg-ph-dot{fill:var(--ease);stroke:var(--stage);stroke-width:2}
.cg-ph-speed{fill:var(--ease);stroke:var(--stage);stroke-width:2}
.cg-ph-label{font-size:11px;fill:var(--ease);font-weight:500;paint-order:stroke;stroke:var(--stage);stroke-width:3px}

.formula{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:10px;padding:8px 8px 8px 14px;border:1px solid var(--line);border-radius:11px;background:var(--bg);min-width:0}
.formula>div{min-width:0;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.formula span{font:9px var(--mono);letter-spacing:.1em;color:var(--muted)}
.formula code{font:500 13px var(--mono);color:var(--accent-text);user-select:all;overflow-wrap:anywhere}
.formula button{min-height:36px;font-size:12px;padding:5px 13px;flex:0 0 auto}
.panel-note{font-size:11.5px;color:var(--muted);margin-top:9px;line-height:1.6}

/* controls: a side column right next to the stage */
.controls{display:flex;flex-direction:column;background:var(--panel);min-width:0}
.group{border:0;margin:0;padding:13px 16px 14px;border-bottom:1px solid var(--line);min-width:0;display:grid;gap:10px;align-content:start}
.more{padding:0 16px}
.more summary{cursor:pointer;min-height:46px;display:flex;align-items:center;font-size:13px;font-weight:600;list-style:none}
.more summary::-webkit-details-marker{display:none}
.more summary:after{content:'+';margin-left:auto;font:16px var(--mono);color:var(--accent-text)}
.more[open] summary:after{content:'−'}
.more-body{display:grid;gap:12px;padding-bottom:16px}
.drag-note{margin-top:-4px}
.group legend{float:left;width:100%;font:10px var(--mono);letter-spacing:.11em;text-transform:uppercase;color:var(--muted);padding:0;margin-bottom:2px}
.group legend span{color:var(--accent-text);margin-right:6px}
.control{min-width:0}
.control-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.control-head label,.control-head .label{color:var(--fg);font-size:13px;font-weight:600}
.hint-inline{font:10px var(--mono);color:var(--soft)}
.curve-picks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;margin-top:6px}
.curve-picks button{min-height:36px;padding:4px 5px;font-size:12px;border-radius:8px}
.chips{display:flex;gap:5px;flex-wrap:wrap;margin-top:4px}
.chips button{min-height:34px;padding:4px 10px;font:500 11px var(--mono);border-radius:7px}
.scale{display:flex;justify-content:space-between;font:9px var(--mono);color:var(--soft);margin-top:-2px}
.hint{font-size:11.5px;color:var(--muted);margin-top:5px;line-height:1.5}
.handles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin-top:6px}
.handles label{font:9px var(--mono);letter-spacing:.06em;color:var(--muted);text-transform:uppercase}
.handles input{margin-top:3px;min-height:38px;padding:6px 8px;font:500 14px var(--mono)}
.check{display:flex;align-items:center;gap:10px;min-height:44px}
.check input{width:20px;height:20px;accent-color:var(--app-accent);margin:0;flex:0 0 20px}
.check label{color:var(--fg);font-size:13px;font-weight:600}

/* learn */
.learn{display:grid;grid-template-columns:1.15fr 1fr;gap:16px;margin-top:18px}
.learn-panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px 22px;min-width:0}
.learn-panel h2{font:620 26px/1.1 var(--display);letter-spacing:-.03em;margin-bottom:12px}
.happening p{font-size:14px;line-height:1.7;color:var(--muted);padding:9px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:84px minmax(0,1fr);gap:12px}
.happening p:first-child{border-top:0}
.happening p .k{font:9px/2.3 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--accent-text)}
.happening b{color:var(--fg);font-weight:600}
.challenges{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.challenges li{border:1px solid var(--line);border-radius:11px;padding:12px 14px;background:var(--bg);transition:border-color .2s}
.challenges li.now{border-color:var(--good)}
.ch-head{display:flex;align-items:center;gap:10px}
.ch-mark{width:18px;height:18px;flex:0 0 18px;border-radius:50%;border:1.5px solid var(--soft);display:grid;place-items:center}
.done .ch-mark{background:var(--good);border-color:var(--good)}
.done .ch-mark:after{content:'';width:8px;height:4px;border:2px solid var(--bg);border-top:0;border-right:0;transform:rotate(-45deg) translate(1px,-1px)}
.challenges strong{font-size:14px}
.challenges p{font-size:12.5px;color:var(--muted);margin:5px 0 0 28px;line-height:1.55}
.challenges .ch-progress{font:11px var(--mono);color:var(--soft)}.now .ch-progress{color:var(--good)}
.challenges details{margin:6px 0 0 28px}.challenges summary{font-size:12px;cursor:pointer;color:var(--accent-text);min-height:28px;display:inline-flex;align-items:center}
.challenges details p{margin-left:0}

/* notes */
.notes{margin-top:16px;display:grid;gap:8px}
.notes details{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:0 20px}
.notes summary{cursor:pointer;min-height:52px;display:flex;align-items:center;font-weight:600;font-size:14px;list-style:none}
.notes summary::-webkit-details-marker{display:none}
.notes summary:after{content:'+';margin-left:auto;font:18px var(--mono);color:var(--accent-text)}
.notes details[open] summary:after{content:'−'}
.notes-body{padding:0 0 18px;max-width:900px}
.notes-body p,.notes-body li{font-size:13.5px;color:var(--muted);line-height:1.75;margin-bottom:10px}
.notes-body ul{padding-left:18px;margin:0}
.notes-body code{font:12.5px var(--mono);color:var(--accent-text)}
.notes-body b{color:var(--fg)}
.notes-body a{color:var(--fg)}
.noscript{padding:20px;color:var(--muted)}
.app-footer{margin-top:26px}

@media(max-width:1280px){
  .question-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .meter-strip{grid-template-columns:repeat(3,minmax(0,1fr))}
  .readout:nth-child(3){border-right:0}.readout:nth-child(-n+3){border-bottom:1px solid var(--line)}
}
@media(max-width:1020px){
  .visuals{grid-template-columns:minmax(0,1fr)}
  .race-panel{border-right:0;border-bottom:1px solid var(--line)}
  .workspace{grid-template-columns:270px minmax(0,1fr)}
  .learn{grid-template-columns:minmax(0,1fr)}
  .graph-wrap{max-width:640px}
}
@media(max-width:760px){
  .app-header{padding-inline:16px;min-height:62px}
  .app-header strong span{display:none}
  .app-main{padding:26px 14px 24px}
  .intro{flex-direction:column;align-items:flex-start;gap:16px;padding-bottom:22px}
  .intro-glyph{width:56px;height:56px;flex-basis:56px}
  .intro-note{gap:14px}.intro-note p{font-size:13px}
  .question-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:8px}
  .question-grid button{padding:12px}.question-grid strong{font-size:13.5px}
  .section-label span:last-child{display:none}
  .bench-toolbar{padding:10px 12px;gap:8px}
  .transport{width:100%}.transport button{flex:1;padding:6px 8px}#play{flex:2;min-width:0}
  .tb-text{display:none}
  .rate{flex:1}.rate button{flex:1}
  .meter-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
  .readout{padding:10px 13px;border-bottom:1px solid var(--line)}
  .readout:nth-child(3){border-right:1px solid var(--line)}
  .readout:nth-child(2n){border-right:0}.readout:nth-child(n+5){border-bottom:0}
  .readout strong{font-size:18px}
  .panel{padding:14px 12px}
  .panel-head h2{font-size:21px}
  .graph-panel .legend{display:none}
  .scene{width:100%}.scene button{flex:1}
  .cg-axis,.cg-handle-label{font-size:15px}.cg-title,.cg-sub,.cg-avg-label{font-size:13px}.cg-ph-label{font-size:16px}.cg-minor{display:none}
  /* phones: stage first and sticky, controls directly under it, graph after */
  .bench{overflow:clip}
  .workspace{display:flex;flex-direction:column}
  .visuals{display:contents}
  .race-panel{order:1;border-bottom:0;padding:8px 10px 6px;position:sticky;top:0;z-index:5;background:var(--panel);box-shadow:0 10px 18px -12px #0008}
  .race-panel .panel-head{margin-bottom:8px}.race-panel .panel-head>div:first-child{display:none}.scene{width:100%}.scene button{min-height:32px}
  .timeline{margin-top:6px;padding:4px 10px 2px}.timeline .scale{display:none}.timeline input{min-height:30px}
  .controls{order:2;border-top:1px solid var(--line)}
  .graph-panel{order:3;border-top:1px solid var(--line)}
  #stage{height:clamp(200px,30vh,250px)}
  .race-panel .legend{display:none}
  .group{padding:14px 14px 16px}
  .more{padding:0 14px}
  .learn-panel{padding:17px 15px}
  .happening p{grid-template-columns:minmax(0,1fr);gap:2px;font-size:13.5px}
  .challenges p,.challenges details{margin-left:0}
  .notes details{padding:0 15px}
}
@media(max-width:420px){
  .question-grid small{display:none}.question-grid strong{font-size:13px}.question-grid span{margin-bottom:6px}
  .curve-picks{grid-template-columns:repeat(3,minmax(0,1fr))}
  .handles{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* Desktop: questions, readouts, controls and stage share one 900px-tall view */
@media(min-width:1100px){
  .app-main{padding-top:24px}
  .intro{padding-bottom:18px}.intro h1{font-size:clamp(38px,3.8vw,54px)}
  .questions{scroll-margin-top:8px}
  .question-grid{margin-bottom:12px;gap:8px}
  .question-grid button{padding:10px 12px 11px;border-radius:10px}
  .question-grid span{margin-bottom:5px}.question-grid strong{font-size:13.5px;line-height:1.25}.question-grid small{margin-top:4px;font-size:10.5px;line-height:1.35}
  .bench-toolbar{padding:8px 14px}.transport button,.bench-actions button{min-height:38px}.tabs button{min-height:32px}
  .readout{padding:8px 16px 9px}.readout strong{font-size:19px;line-height:1.3}.readout em{font-size:10.5px}.readout[data-tone]:before{top:11px}
  .panel{padding:12px 14px 14px}
  .panel-head{margin-bottom:8px;align-items:center}.panel-head .eyebrow{margin-bottom:3px}.panel-head h2{font-size:20px}
  #stage{height:300px}
  .race-panel .legend{margin-top:6px}
  .timeline{margin-top:8px;padding:6px 12px 4px}.timeline input{min-height:28px}
  .formula{margin-top:8px;padding:5px 6px 5px 12px}.formula button{min-height:32px}
  .panel-note{margin-top:6px}
  .group{padding:6px 16px 10px;gap:8px}
  .group legend{margin-bottom:0}
  .curve-picks{display:flex;flex-wrap:wrap;gap:4px}.curve-picks button{flex:1 1 auto;min-height:34px;font-size:12px;padding:3px 9px;white-space:nowrap}
  .controls .scale,.controls .group .hint:not(#curveHint):not(#durationHint):not(.drag-note){display:none}
  .control .chips{gap:4px;flex-wrap:nowrap}.control .chips button{min-height:30px;padding:3px 0;flex:1 1 0;font-size:10.5px}
  .controls input[type=range]{min-height:30px}
  .more-body .hint{display:block}
}